Furnace grate or fire pot



Jan. 1, 1935. A K 1,986,117

FURNACE GRATE OR FIRE POT Filed July 17, 1933 3 Sheets-Sheet '1INVENTOR." HHRULD F 01 LHC'K Jan. 1, 1935. H. POLLACK FURNACE GRATE ORFIRE POT Filed July 17, 1955 3 Sheets-Sheet 2 Jan. 1, 1935. PQLLACKFURNACE GRATE OR FIRE POT Filed July 1'7, 1935 S Sheets-Sheet 3INVENTOR. HHFFULD PULLHCK ATTORNEY Patented Jan. 1, 1935 "UNITED STATES'FURNACE GRATE 0R FIRE POT Harold Pollack, NewYork, N. Y., assignor toBituminous Crucible Company, N. Y., a corporation of New York New York,

Application July 1'7, 1933, Serial No. 680,845 In Canada April '7, 193318 Claims. (Cl. 126- 176) My invention relates to furnaces and moreparticularly to grates or fire pots of the basket type especiallyadapted for use in connection with rectangular combustion chambers.

At the present time furnaces adapted for burning bituminous andanthracite coalare generally provided with agrate upon which the coal issupported, the coal being piled up in the combustion chamber above thegrate and against fire brick or other fixed walls. Air for combustion isgenerally admitted to the furnace or combustion chamber below the .grateand rises through the grate, glowing embers, and coal for mixture withthe gases expelled from the coal for combustion. Ashes accumulate on thegrate requiring the shaking down of the fire from time to time in orderto permit circulation of air in the manner specified. However, suchshaking does not freely loosen or expel ashes which have accumulatedaround the side walls, so that, even though the ashes are shaken throughthe grate from the bottom ofthe fire there will be ashes accumulatedaround the fire brick at the sides of the combustion chamber thusdiminishing the supply of air for admixture with the gases forcombustion, resulting in imperfect combustion, hence loss ofheat units,and in the case of certain coals a great quantity of smoke and soot.

The general object of my invention is to provide furnace gratestructures which may be installed in existing furnaces after removal ofthe usual type of grate above referred to, and providing a greatersupply and circulation of air for combustion, as well as affordingexpelling or shaking down the ashes accumulated at the sides of thefire. This is .due to the fact that grates or fire pots constructed inaccordance with my invention have movable elements constituting sideWalls, or some of the sidewalls, which move preferably simultaneouslywith the bottom grate bars. Furthermore, the construction andarrangement is such that grates or fire pots embcdying my invention,even though of consider,- able size for large furnaces, will effectbreaking up of the coked fuel when the parts are moved to shake down theashes or to regulate the supply of air. So far as I am aware, I am thefirst person to have provided an operative structure for theaccomplishment of the foregoing in connection with a rectangular furnacestructure.

There being different sizes of furnaces having rectangular pits orchambers which receive the grate, I provide for making the gratesembodying. my invention of sizes corresponding substantially to thestandard furnace fire chambers,

preferably with provision for means of effecting adjustment of the grateto meet any variations in the standard existing furnace chambers. Inthis connection I would mention that inmost cases the chambers areprovided by brick walls 5 and the front plate-of: the furnace, all ofwhich are more or less permanent structures. Furthermore, gratesconstructed in accordance with my invention preferably have marginalportions disposedin; a substantially horizontal plane to 10 abut theinner surfaces of the walls of the furnace so that air may circulatebetween the walls and thesides of the grate foradmission through thesides, as well as the bottom, to greatly in-- crease the supply andcirculation of air to and 15 through the fire and the fuel for admixturewith the gases expelled from the heated fuel, whereby coal of relativelyvolatile nature may be burned withsubstantially no creation of smoke ascom-'- pared tothe generally existing grate structures 20 hereinbeforementioned.

'In actualpractice, I have found that-where agrate embodying myinvention replaces a grate of usual construction in an existing Tfurnace structure, that more heat-units :are obtained, 25 substantiallyno's'mok e is created, at least none is noticeable when'observing thechimney either when or immediately after firing, or at any other timeduring operation, and at the same time less fuel is consumed. In thecase of bitumi- 3Q nouscoal, the greatly increased supply of air,possible regulation of the supply of airQbreaking up of the fire inseveral directions when shaking the grate structure, greatly facilitatecoking the fuel.

All of the objects and advantages of the invention will become apparentand will beparticularly pointed out during the course of-the followingdetailed description of the accompanying. drawings, in-which is shown apreferred em- 0 bodiment of the invention, and wherein Fig. 1 is aperspective; view of a'grate or, fire pot embodying the invention shownpositioned relative to fragments of walls and the front plate of afurnace;

Fig. 2 is an elevation of a' fragment of the front of a grate embodyingthe invention;v

Fig. 3 is a top plan view of a corner or fragment of the same. grate.with parts broken away;

Fig. 4 is aperspective view of a nutemployed 50 to hold certain parts inadjusted position;

Fig. 5 is aside elevation partly in section of Fig. 6 is'a view taken onthe line (S -6' of Fig.5;

the grate shown in Fig. 1;

Fig. 14 is a fragmentary side view of the parts shown in Fig. 13;

Fig. is another view similar to Fig. 6show ing a further modification inthe means for moving the grate bars; and

Fig. 16 is a fragmentary side elevation of the parts shown in Fig. 15.

Referring in detail to the drawings and par ticularly to Fig. 1, thenumeral 8 designates the side'and rear brick walls of the furnace,defin- 'ing in connection withthe front plate 9, the

chamber for the reception of thegrate, the lower portion of which, ofcourse, is the ash pit and the portion above the grate being thecombustion chamber. Uprights 10 rest on the bottom of the ash pit, andin order to provide for vertical adjustment of my grate relative toexisting fur nace structures, I may provide each of the uprights 10 witha toothed face 11. These uprights 10 form part of the base supportingstructure to hold the grate above the ash pit and coop- ,erate withdepending arms 12 on the cross bars .13, 13'. It will be noted that thearms 12 also have a toothed face confronting the toothed face on theupright 10 with the teeth of each in mesh, and-the arms 12 and uprights10 are also provided with registering slots 14 which receive bolts 15extending all the way through the arms 12 and uprights 10 to receivenuts which, when tightened, will hold the parts in any adjusted positionto support the grate in any desiredposition relative to the floor of theash pit and the boiler above the fire. The bars13, 13 overlap and areprovided with slots 16 adapted to register to receive bolts 1'7extending'through the parts 13 and 13 also to receive nuts which, whentightened, will hold the bars 13, 13"in any desired laterally adjustedposition. Thus, the base or supporting structure for the grate may beadjusted vertically and'laterally to fit within different sizedfurnaces, and there being only one of the supporting structures at eachend of the grate and the same being unconnected, it isnot necessary toprovide for longitudinal adjustment of the. supports. Consequently, itis necessary to carry in stock only standard sized parts 10 and12-13.

' The grate proper includes carrier or side bars,

'23 on bar 24 extending across the front of the grate adjacent the frontplate 9 of the furnace andhaving its ends beveled to rest oncorrespondingbeveled surfaces on-the ends 19-of the carriers 18. Each ofthe ends 19 is also provided .(see Fig. 5) with an opening 25, and afront plate 26 is formedwith'corners 27" to the bottom of which aresecured lugs 28, the lugs at opposite sides of the front plate beingdisposed in the openings and the bottom of the plate 26 resting on thetop of the plate 24. The upper central portion of the plate 26 isrecessed and surrounded by a flange or lip 29 which is adapted toregister with the furnace door opening in the front plate 9. Beneath theflange or lip 29 are openings 30 formed in the front ,wall of the plate26 for passage of air to the fire. At the top of the corners 2'? arehorizontally disposed flanges 31.

At the rear of the grate is an end carrier 32 similar to the carriers18, but, in the instance shown, I of lesser length, and having its endsbeveled corresponding to the beveled ends of the plate 24 to engageagainst beveled surfaces on the ends 19' at the rear of the grate. Abovethe rear ends 19 of the side carriers 18 are .corner pieces 34 similarto the corners 27 and having depending lugs engaging in openings in theends 19. Between the corners 34 across the grateand at its top is aplate or collar 35 having its ends ofiset as at 36 to receive angleclips '37. Similar plates 38 are mounted along the sides of the gratehaving one end disposed beneath the clips 3'7 and their other ends alsooifset as at 39 and disposed beneath front clips 40, which rest also onthe flanges 31. As shown in Fig.3, the clip 40, like all of the othercorner clips, is provided with a longitudinally disposed slot 41" in theplane of the side of the grate and a'transverse slot 42 in the plane ofthe front and back. These slots register with similar slots in theoifset ends 39 of the side plates 38, offset ends 36 of the rear plate35 and flanges 31. Jam nuts shown in detail in Fig. 4, and indicatedgenerally by the numeral 43, are mounted through the slots with the head44 engaging against the tops of the clips, the shank extending throughthe registering slots and the end 45, which has cam faces, disposedagainst the bottoms of the offset ends 39, 36, and flanges The clipsthus hold the top plates 35, 38, and

front plate 27 together, and the rear corners 34 have at their topsprojections 46 which extend into openings in the rear clips 3'7 to holdsaid corners in upright position.

As shown in detail in Fig. 6 the collars 38 and top walls-of carriers 18are provided with alined g5;

the trunnion 50. The sides of the keys 53 are beveled as indicated at 55(Fig. '7) and the carriers 18 are provided with recesses 56 (Fig. 5)having beveled sides to receive the beveled sides 55 of the keys. Whenthe keys are inserted they look the grate bars in position and affordthe bearing surface for the shoulders 52. The carriers 18 are alsoprovided with recesses 57 in alinement with the openings 50. Therecesses 5'7 form a bearing for the trunnions 53 on the horizontal gratebars 59. A toothed segment 60 is keyed to each end of the grate bars'59, thatis, to each of the trunnions 58 and meshes with the teeth onthe segment 61 keyed to the lower end of each of the trunnions 50 of thevertical grate bars. The carriers 18 also have (see Fig. 3) beveledslots 62 receiving upright keys 63, the sides of which are beveled as at64 to fit the beveled slots 62. The keys 63 have a notch 65 in theirlower ends which is disposed over the trunnions 58 when the keys .72depending ears are in the position shown in Fig. 6', wherein the upperend ofeach of the keys 63 is in ali'nement with and prevents withdrawalof-the key 53.

In the embodiment shown in the drawings, there are nine horizontal gratebars and. eighteen vertical side grate bars and five rear ver:- ticalgrate bars 51'. The latter are not connected in any way with mechanism.forimparting movement thereto but have their ends 50. disposed inopenings 48 in the rear carrier32 and trunnions 43 at their top similarto the trunnions 49 disposed in openings 47" in the collar 35. The rearvertical grate bars are consequently movable as hereinafter explained.

The grate shown in the drawings being of considerable sizeand beingmanually operated to shake itthere would preferably beitwo shaker rodsone controlling four of the; horizontal and alined: vertical. side barsand the other controlling the remaining horizontal and.'vertical bars.In Figs. 5 and 6, the separate connection; of v the shaker bars 66 and69, one on the right and one on the left. of the furnace is illustrated.The rod 63 is connected to a. coupling '70 on the'bar 71 to which areconnected as bybolts 73 of the horizontal grate bars. The rod 69 isconnected to a similar: coupling. 70 on a plate, 71' alsopivotallyconnected to the remaining horizontal grate bars. The bar 69 isshown in Fig. 1 connected to a lever actuatingmechanism of known typedesignatedgenerally by the numeral 75. When the rod 69 is reciprocatedthe bar '71 is also recipro'cated and the. grate bars 59 are oscillatedon their trunnions. 58, thus oscillating the segments 66 and 61, hencealso oscillating the vertical side grate bars.

Referring to Fig. 3, it will be noted thatthe collars 38 are providedwith a plethora of openings I6 and thecarriers 18 also have openings'I'lbetween the keys which lock the grate bars in. place, all of saidopenings being for passage of air. With the grate installed as shown. in

- Fig. 1, air can enter the ash. pit beneath the grate, circulatebetween the vertical gratebars and walls of the furnace through theopenings between the vertical grate bars at the sides and back of thegrate also through the space between the horizontal grate bars at thebottom and through the openings 77 in the carriers 18 at the bottom ofthe fire and through the openings 76 in the topplates or collars.Furthermore, movement ofthe rods 68 and 69 will turn the bars'59 ontrunnions 58 and hence the segments 60 and 61, so that the verticalgrate bars as well as the horizontal grate bars maybe adjusted todifierent open positions to increase or diminish the supply .of air.

Before discussing the operation of the grate, I would refer again to itsinstallation and particularly to the provision for adjustment of thegrate to meet varying conditions or sizes of furnace chambers. Let usassume, for instance, that the grate is to be installed in a furnacestructure having a rectangular space sin and a half feet long, each ofthe horizontal grate bars 58 may be six inches wide and nine of thesewith space between figured in would make the length of the bottom of thegrate sixty-two inches. This length is fixed and not adjustable as theside carriers 18 of each grate are made of a definite length accordingto the number of bars they support. The rear vertical grate bars wheninstalled in position incline slightly back the, vertical grate barsmore or a replacement of vertical or horizontal, it is not necessary todisand the frontiplate inclines slightly forward, so that-thalengthofthegrate from the back edge of the plate 35 to the front edge of theplate2.7 or clips 40 would be about seventy-four inches. With a chamberseventy-eight inches long, there would be four'inches shortage, so totake care of this the jam nuts are loosened plate 27: and back plate 35inclined to the dotted line position of Fig. 5'unti1 the gratecompletely fills the chamber, that is, until the back edge of the plate35 is in contact with the wall and the front and the lip "29 is incontact with the furnace front. The same'adjustment may be made bydropping one or both of the sides 33 to incline less as required. Ofcourse, the possible amount of adjustable movement is limited by thelength of the slots through which the jam nuts extend and any variationsover six inches would call for a different length of carrier. After thegrate has been adjusted to contact the walls of the chamber, the jamnuts are turned, so that the cam faces will tighten the parts and holdthem in proper position. 1

The fire is built preferably in a concave condition, that is, the coalis banked toward the sides and back of the grate up on top of the plates35-and 38 sloping from each side and the back down to the middle. Theside vertical grate bars are eitherin the position of Fig.1, that is,open any desired extent or substantially alined in a common plane whichmight be termed closed position. In either event, when it is necessaryto shake the fire, the lever mechanism '15 is operated to reciprocatethe rods68 and 69, so that the horizontal grate bars and vertical sidegrate bars will be oscillated to shake the ashes down from the sidesaswell as the bottom of the fire. Such shaking movement breaks'up thefire, and since the rear vertical grate bars are loosely mounted, thebreaking up of the fire will tend to move the rear vertical grate bars,and hence shake ashes from the rear of'the grate.

-If, at any time, it becomes necessary to make any of the grate barseither mantle the whole structure, as the keys 53 and 63 are removable,and, of course, the segments 60 and 61 are removably keyed to the endsof the trunnions 58 and 50 respectively. Therefore,

after removing the keys 53 and 63, the cotter pins or other means forkeying the segments to the trunnions of the grate bars are removed,permitting removal of any one of the side or bottom gratebars forreplacement.

In Figs. 8-17 inclusive, the numerals 56, 51", 38 designate thecorresponding unprimed parts of Figs. 1-6, namely, the bottom gratebars, upright grate bars, and top collars respectively.

Referring to Figs. 8 and 9, the side carrier plates 80 have openings 81through which extend trunnions 82 of the bottom grate bars 59', thetrunnions 82 being longer than the trunnions 58 of Fig. 6, and having attheir outer end upstanding fingers 83. The tops of the side carriers 89also have openings 84 receiving the trunnions 85 on the side grate bars51', the lower ends of the trunnions 85 being connected to forked memahas 86 between the arms of which are disposed the upstanding fingers 83.Obviously, when the bottom grate bars areshaken as by the mechanismshown and described in connection with 'Figs'. 1-6, the trunnions 82will be oscillated and the fingers 83 will swing like an invertedpendulum alternately engaging the arms of the yoke members 86 and henceoscillating the. side grate bars 51. I

In Fig. 10, I have disclosed an arrangement whereby the bottom gratebars and Side grate bars may be independently moved. ,The bottom gratebars have trunnions 88 disposed through openings 89 in the side carrierand also have the depending lugs 73 connected to the shaker plate 71'.The bottom grate bars 59 of Fig. 10 are oscillated in exactly the samemanner as the bottom grate bars of Figs. and 6, but their movement doesnoteifect movement of the side or upstanding grate bars, because thereis no connection therebetween under the arrangement of Fig. 10. Thetrunnions 52 of the side grate bars are disposed in openings in the topvof the side carrier as in Fig. 6, but the side grate bars 51' haveconnected thereto laterally extending lugs 90 connected to the shakerbar 91 similar to the shaker bar 71 and operated by mechanism such asdisclosed in connection with the shaker bars 71 of Fig. 5. 'Under thearrangement of Fig. 10, the upright grate bars may be'oscillated at anytime without oscillating the bottom grate bars and vice versa. I r

In Fig. 11, I haveshown an arrangement similar to Fig. 10, but wherein Iprovide a connection between the trunnions of the side grate bars andbottom grate bars, so that shaking movement of either the bottom or sidegrate bars will effect shaking movement of the other. This isaccomplished by providing the side grate bars with the lugs 90'connected to shaker bar 91 and the bottom grate bars with the lugs 73connected with the shaker bar '7l- The trunnions 88' of the bottom;grate bars arekeyed tosegmental gears 60' similar to the segmental gears60 of Fig. 6, and the trunnions 52 of the side grate bars are keyed tosegmental gears 61" the same as in Fig. 6. Under this arrangement, it isquite obvious that manipulation of the shaker lever connected with thebar 71 will effect shaking movement of both the bottom and side gratebars, as also will manipulation ofthe shaker lever connected with thebar 91'. I

In all of the embodiments of the invention thus far described, the sidebars and bottom bars have oscillating movement, that is,they arepivotally mounted and turned on their trunnions mounted through the sidecarrierand the upper collar plates. It is not essential to the practiceof the invention, that such motion be imparted to the side grate bars toeffect shaking down of the ashes at the sides of the grate, and in Figs.1216 I have disclosed mechanism forefiecting other movements of the sidegrate bars.

In Fig. 12, the collar plates 38 are provided with relatively wideopenings 98 and the side grate bars 51' do not have trunnions at theirtops and bottoms but have their tops disposed in the openings 98, saidopenings being of a length corresponding to the width of the grate barsso as to house the tops. At their bottoms, the grate bars are providedwith outwardly extending lugs or brackets 99, each having an opening 100within which is disposed an eccentric 101 keyed to a rod 102 leading outthrough the wall of the furnaceto a crank or handle for rotating therod. The rod is rigidly supported in bearings, not shown, and which maybe formed in the furnace wall so that the rods will support the gratebars at opposite sides of the grate. It will be noted that the lowerends of the grate bars are spaced from the side carrier which isprovided with openings in its side wall and designated by thenumeral 103to receive the trunnions 104 of the bottom grate bars, which, as in thecase of Fig. 11, are provided with depending lugs for connection withthe shaker mechanism disclosed in Figs. 16. It willthus be understoodthat the bottom grate bars are oscillated or shaken in the manneralready described, and that such movement does not effect movement ofthe side grate bars. When the rod 102'is rotated, the eccentrics 101 arealso rotated within the openings of the lugs 99, so that the side gratebars will be swung from left to right of the position shown of Fig. 12,and also moved up and down at the same time.

In Figs. 13 and 14, I have disclosed mechanism for effecting oscillationof the 1 bottom grate bars inthe'manner described in connection withFigs. 1-12, and to also effect an .up and down movement to the sidegrate bars. The side grate bars 51. instead of having a trunnion attheir lower ends have a substantially fiat end as designated by thenumeral 105, and the upper ends are also disposedthrough the openings98' in the upper collars similar to the openings 98. The lower endsextend through openings 106 in the tops of the side carriers and rest oncams 107. As shown in Fig. 14, each of the cams 107 has two humps 108supporting the side grate bars. The cams 107 are keyed to the squaredends 109 of the trunnions 110 of the bottom grate bars. When the bottomgrate bars'are oscillated as hereinbefore described, the cams will alsobe oscillated and the side grate bars will be raised and lowered,sliding up and down through the openings 106 and 98' to shake the ashesdown.

The arrangement shown in Figs. 15 and 16 is similarto that shown inFigs. 14 and 15, except that the side grate bars may be provided attheir tops and bottoms with extensions 111 and 112 respectively andmounted through openings in the collars 38 and side carriers to hold thegrate bars in proper position. The bottom grate bars have trunnions 110'with squared ends 109 receiving the cams 113. There is a clearancebetween the top and bottom of the grate bars and the side carriers andcollars 38, and the stem 112 normally rests in a notch 114 in the cam113. Obviously, when the bottom grate bars are oscillated the cams 113will be oscillated and the stems 112 will alternately be engaged by theprojections or humps on each side of the notch 114 so that the gratebars will be given an up and down motion to shake the ashes down fromthe sides.

I claim:

1. A grate or fire pct comprising a plurality of horizontally pivotedbars forming a substantially rectangular grate bottom, a plurality ofsubstantially vertical bars alined in pairs at opposite ends of each ofthe first bars and form ing sides of the grate, means for oscillatingsaid horizontal bars, and means operable by oscillation of saidhorizontal bars for imparting movements to the vertical bars.

2. A grate or fire pot comprising a plurality of horizontal grate barseach journaled upon horizontal axes and forming a grate bottom, ,aplurality of substantially vertical grate bars alined in pairs atopposite ends of the horizontal bars and forming upright side walls ofthe grate, means to oscillate said horizontal bars, and a separateconnection between each of said horizontal bars and said upright barsfor imparting movement to the" latter when the former areoscillated. I 1

3. A grate or fire pot comprising 'a'plurality of horizontal grate barsformingra rectangular grate bottom, a plurality of substantially verti-'cal grate bars ali'ned in pairs at opposite ends of the horizontal barsand forming upright'walls of the grate, means to oscillate-saidhorizontal barsgand a separate connection between each of saidhorizontal bars and'said upright bars for imparting oscillating movementto the latter when the former are oscillated, said bars, beingindividually removable from the grate structure.

4. A grate or fire pot comprising a plurality of horizontally pivotedbars forming-a substantially'rectangular grate bottom, a plurality ofsubstantially vertical bars alined in pairs at;op= posite=ends of eachof the first bars and forming sides of the grate, all of saidbars'beingjoscillatable', means for oscillating said horizontal bars,and meshing gears on said horizontal bars and said vertical bars forimparting oscillating movements to the vertical bars by oscillatinmovements of the horizontal bars.

5. A rectangular grate or fire pot having a plurality of pivotallysupported bars forming a rectangular bottom, a plurality of upstandingbars forming sides of the grate, plates pivotally supporting said firstbars, plates supporting the upper ends of said second bars, and cornerpieces spacing said first and second plates and adjustably connectingthe ends of said second plates and afiording movement thereof to tiltsaid side bars.

6. A grate or fire pot having a plurality of grate bars forming arectangular bottom, a plurality of upstanding bars forming sides of thegrate, plates supporting the ends of said first bars and the lower endsof said second bars for oscillatory movement, plates supporting theupper ends of said second bars, corner pieces spacing said first andsecond plates and 'adjustably connecting the ends of said second platesand affording relative movement thereof to tilt said side bars, andmeans to oscillate all of said bars.

7. A grate or fire pot comprising a plurality of horizontal grate barshaving trunnions at their ends, carrier bars having journals receivingsaid trunnions, a plurality of side grate bars upstanding at oppositeends of said horizontal bars and forming sides of the grate, removablekeys on said carrier forming a journal for said upstanding bars,removable elements holding said keys in place, and means forcollectively oscillating said horizontal and upstanding bars.

8. A grate or fire pot comprising a plurality of horizontal grate barshaving trunnions adjacent their ends, carrier bars having journalsreceiving said trunnions, gears on the ends of said horizontal bars, aplurality of side grate bars upstanding above said carrier bars andpivotally supported thereby and. forming side walls of the grate, gearson the lower ends of said upstanding grate bars meshing with said firstgears, and means for oscillating said horizontal bars and gears carriedthereby to also cause oscillation of said second gears and bars.

9. A grate or fire pot comprising a plurality of horizontal grate barshaving trunnions at their ends, carrier bars having journals receivingsaid trunnions, a plurality of side grate bars standing above andsupported at their lower ends by said carrier bars and forming sidewalls of the grate, meshing gears on the ends of said horizontal barsand upstanding bars, and. collar plates above said carrier barspro'vidin'g j ouriials' for the upper'ends ofsaidupstanding,'grate'bars; 10." A grate or fire -pot"c'omprising a Yplurality or horizontal "grate bars having trunnions at their ends,carrier bars having fiournals re'eeiv ing said trunnions, a plurality ofside grate bars standing" above and supported "at their lower ends bysaidcar'rier bars and forming sidewalls of the grate, meshing gears onthe'ends of said horizontalbars and upstanding bars,collar plates abovesaid carrier bars providing journals for the upper ends of said'upstandinggrate bars, and means adjustably connecting said eonarpiatesand affording tiltll l'g movement of SE lid upstanding grate bars:I a ll. A g'rate orffire p'ot comprising a plurality of horizontalgratebars, carrier bars supporting said horizontal grate bars andafiordingoscillaF ingmov'einnt ,jthe'reof upstanding grate barssupported at theirlo ends by "said carrier bars for osc'niatingmdvinent;plates "slows-said, carrier bars providing journals for the upper endsof said side grate bars and disposed in a substantially horizontal planeand projecting outwardly beyond said side grate bars, and means foroscillating said horizontal and upstanding grate bars.

12. A grate or fire pot comprising a plurality of horizontal grate bars,carrier bars supporting said horizontal grate bars and affordingoscillating movement thereof, upstanding grate bars forming sides of thegrate, plates above said carrier bars movably supporting the upper endsof saidside grate bars and disposed in a substantially horizontal planeand projecting outwardly beyond said side grate bars, means forosci1lat-' ing said horizontal bars, and means at the ends of saidhorizontal bars and the lower ends of said upstanding bars to impartmovement to said upstanding bars when the horizontal bars areoscillated.

13. A grate or fire pot comprising a plurality of horizontal grate bars,carrier bars supporting said horizontal grate 'bars and affordingoscillating movement thereof, upstanding grate bars supported at theirlower ends by said carrier bars for oscillating movement, plates abovesaid carrier bars providing journals for the upper ends of said sidegrate bars and disposed in a substantially horizontal plane andprojecting outwardly beyond said side grate bars, means for oscillatingsaid horizontal grate bars, and interengaging elements on each end ofthe hOTi-r zontal bars and the lower ends of said upstanding barswhereby oscillation of said horizontal bars will impart movement to saidupstanding bars.

14. In a grate or fire pot including bottom carrier bars, corner piecesmounted on said carrier bars at the ends of the grate, collar plates atthe top of the grate between said corner pieces, upstanding grate barsbetween said collar plates and carrier bars forming side walls of thegrate,

ing bars being movably supported between said collar plates and carrierbars, and means detachably'securing all of said grate barsindividuplates on approximately vertical axes and forming side and rearwalls of the grate, and a front plate connecting opposite sides of thestructure, a substantial portion of said front plate being of lesserheight than said walls.

16. A rectangular grate or fire pot comprising upper and lower plates,means holding said plates in spaced relation, horizontal grate barssupported by said lower plates and forming the bottom of the grate,substantially vertical grate bars having their upper ends disposed inopenings in said upper plates and mounted for up and down motion, meansfor oscillating said horizontal grate bars, and means carried by saidhorizontal grate bars engageable with the lower ends of said verticalgrate bars to impart to said vertical grate bars up and down motion whenthe horizontal bars are oscillated.

17. The structure of claim 18 wherein the means carried by thehorizontal grate bars for imparting the up and down motion to thevertical grate bars comprise cams on the ends of said horizontal grate'bars supporting the lower ends of the vertical grate bars.

18. A rectangular grate or fire pot comprising upper and lower plates,means holding said plates in spaced relation, horizontal grate barspivotally mounted between said lower plates, substantially verticalgrate bars having their upper ends disposed in openings in said upperplates, means supporting the lower ends of said vertical grate bars,means to oscillate said lower grate. bars, and means independent of saidlast means to impart reciprocating shaking movement to said verticalgrate bars, said upper plates which support the upper ends of thesubstantially vertical bars extending laterally beyond said bars andlower plates to provide an air chamber between said bars and the wallsof a furnace structure.

HAROLD POLLACK.

